WO2015025392A1

WO2015025392A1 - Transformer

Info

Publication number: WO2015025392A1
Application number: PCT/JP2013/072360
Authority: WO
Inventors: 敏弘野田
Original assignee: 三菱電機株式会社
Priority date: 2013-08-22
Filing date: 2013-08-22
Publication date: 2015-02-26
Also published as: JPWO2015025392A1

Abstract

A transformer is provided with: a core (110) comprising a first leg part (111) and a second leg part (112); a first coil group (G1) comprising a plurality of high-pressure-side coils wound around the first leg part (111), and a plurality of low-pressure-side coils; a second coil group (G2) comprising a plurality of high-pressure-side coils wound around the second leg part (112), and a plurality of low-pressure-side coils; a tank (130) housing the core, the first coil group (G1), and the second coil group (G2) in a state of being immersed in insulating oil; a cooler (140) which cools the insulating oil; a pump (150) which circulates the insulating oil; and a metal plate (135) which is positioned between the first leg part (111) and the second leg part (112). The low-pressure-side coil of the first coil group (G1) and the low-pressure-side coil of the second coil group (G2) are coupled to separate loads. For the metal plate (135), at least one end of the metal plate (135) is extended so as to be connected to a sidewall (138) of the tank (130). The pump (150) causes the insulating oil to pass through the cooler (140) and to move in between the first coil group (G1) side and the second coil group (G2) side, which are separated by the metal plate (135) on the one end side, within the tank (130).

Description

Transformer

The present invention relates to a transformer, and more particularly to a vehicle-mounted transformer.

Japanese Patent No. 4523076 (Patent Document 1) is a prior document disclosing a transformer in which an iron core is provided between adjacent coil groups. In the transformer described in Patent Document 1, an iron core is provided between adjacent coil groups, thereby reducing the reactance while reducing the height and reducing the size.

International Publication No. 2008/007513 (Patent Document 2) is a prior art document that discloses a transformer for a vehicle that is provided with a partitioning member so as to divide the inside of the tank into two parts to reduce the size and weight. In the vehicular transformer described in Patent Document 2, the refrigerant flow path that flows inside the winding is divided into a first refrigerant flow path and a second refrigerant flow path by a partition member.

A cooling device that connects the first refrigerant flow path and the second refrigerant flow path on one end side of the tank and is connected to each of the first refrigerant flow path and the second refrigerant flow path on the other end side of the tank. It arrange | positions so that a refrigerant | coolant may circulate through the 1st refrigerant flow path and the 2nd refrigerant flow path.

Japanese Patent No. 4523076 International Publication No. 2008/007513

To reduce the size and weight of the transformer, the tank has been made thinner. To the side wall of the tank, a cooler provided outside the tank and a pipe for connecting the pump and the tank are connected to circulate and cool the insulating oil. Vibration propagates through the pipe to the side wall to which the pipe is connected. When the side wall is formed so as to have a strength that can withstand this vibration, the side wall becomes thick and becomes an obstacle to thinning the tank.

The present invention has been made in view of the above problems, and provides a transformer capable of reducing the reactance by reducing the size and weight while ensuring the strength of the side wall of the tank while reducing the thickness of the tank. For the purpose.

A transformer according to the present invention includes an iron core having a first leg and a second leg arranged at a distance from each other, a plurality of high-voltage side coils wound around the first leg, and the high-voltage side coil. A first coil group including a plurality of low voltage side coils provided correspondingly and magnetically coupled to a corresponding high voltage side coil, a plurality of high voltage side coils wound around the second leg, and the high voltage side coil And a second coil group including a plurality of low-voltage coils that are magnetically coupled to the corresponding high-voltage coil, and the iron core, the first coil group, and the second coil group are accommodated in an immersion oil. A tank for cooling the insulating oil, a pump for circulating the insulating oil, and a metal plate positioned between the first leg portion and the second leg portion. Each high-voltage coil receives a common single-phase AC power. The low voltage side coil of the first coil group and the low voltage side coil of the second coil group are coupled to separate loads. In the metal plate, at least one end of the metal plate extends so as to be connected to the side wall of the tank. The pump moves the insulating oil through the cooler between the first coil group side and the second coil group side in the tank separated by the metal plate on the one end side.

According to the present invention, while reducing the thickness of the tank while ensuring the strength of the side wall of the tank, the transformer can be reduced in size and weight, and the reactance can be prevented from being lowered.

It is a plane sectional view showing composition of a transformer concerning Embodiment 1 of the present invention. It is the perspective view which looked at the internal structure of the transformer of FIG. 1 from the direction shown by arrow II. It is a plane sectional view showing the composition of the transformer concerning a comparative example. It is the graph which compared the pressure and flow volume of the insulating oil which flow in the tank in the transformer which concerns on the embodiment, and the transformer which concerns on a comparative example. It is a circuit diagram which shows the structure of the AC train containing the transformer which concerns on the same embodiment. FIG. 3 is a view showing a VI-VI cross section of the transformer main body in FIG. 2 and currents and magnetic fluxes generated in the transformer main body. It is a figure which shows the leakage magnetic flux in the transformer which concerns on the same embodiment. It is a figure which shows the main magnetic flux at the time of the one side operation | movement in the transformer which concerns on the same embodiment. It is a figure which shows the leakage magnetic flux at the time of the one-side driving | running in the structure assumed that the transformer which concerns on the same embodiment is not provided with a metal plate. It is a figure which shows the leakage magnetic flux at the time of the one-side driving | operation in the transformer which concerns on the same embodiment. It is a circuit diagram which shows the structure of the alternating current train containing the transformer which concerns on Embodiment 2 of this invention. It is a circuit diagram which shows the structure of the alternating current train containing the transformer which concerns on Embodiment 3 of this invention. It is a plane sectional view showing the composition of the transformer concerning Embodiment 4 of the present invention. It is the perspective view which looked at the internal structure of the transformer of FIG. 13 from the direction shown by arrow XIV.

Hereinafter, a transformer according to Embodiment 1 of the present invention will be described with reference to the drawings. In the following description of the embodiments, the same or corresponding parts in the drawings are denoted by the same reference numerals, and the description thereof will not be repeated.

(Embodiment 1)
FIG. 1 is a cross-sectional plan view illustrating a configuration of a transformer according to Embodiment 1 of the present invention. FIG. 2 is a perspective view of the internal configuration of the transformer of FIG. 1 as seen from the direction indicated by arrow II. As shown in FIGS. 1 and 2, the transformer 100 according to Embodiment 1 of the present invention is a shell-type transformer.

The transformer 100 includes an iron core 110 having a first leg portion 111 and a second leg portion 112 that are arranged at a distance from each other. The iron core 110 is composed of laminated magnetic steel plates. The iron core 110 has one side surface and the other side surface that face each other, and a window portion W1, a window portion W2, and a window portion W3 that penetrate from one side surface to the other side surface. The first leg portion 111 is located between the window portion W1 and the window portion W2. The second leg portion 112 is located between the window portion W2 and the window portion W3.

The transformer 100 is provided corresponding to the plurality of high

voltage side coils

1A and 1B wound around the first leg 111 and the high

voltage side coils

1A and 1B, and is magnetically coupled to the corresponding high

voltage side coils

1A and 1B. The first coil group G1 including the plurality of low-

voltage coils

2A and 2B.

Moreover, the transformer 100 is provided corresponding to the plurality of high

voltage side coils

11A and 11B wound around the second leg 112 and the high

voltage side coils

11A and 11B, and the corresponding high

voltage side coils

11A and 11B. A second coil group G2 including a plurality of magnetically coupled low

voltage side coils

12A, 12B is provided.

Each of high

voltage side coils

1A, 1B, 11A, 11B and low

voltage side coils

2A, 2B, 12A, 12B includes, for example, a plurality of stacked disk windings. Adjacent disk windings are electrically connected. Each disk winding in the high

voltage side coils

1A, 1B, 11A, 11B and the low

voltage side coils

2A, 2B, 12A, 12B is formed by a conductive wire having a rectangular cross section wound in an approximately elliptical shape.

The high voltage side coil 1A is provided between the low voltage side coil 2A and the low voltage side coil 2B at a position facing the low voltage side coil 2A, and is magnetically coupled to the low voltage side coil 2A. The high voltage side coil 1B is provided at a position between the low voltage side coil 2B and the low voltage side coil 2B and is opposed to the low voltage side coil 2B, and is magnetically coupled to the low voltage side coil 2B.

The high voltage side coil 11A is provided between the low voltage side coil 12A and the low voltage side coil 12B at a position facing the low voltage side coil 12A, and is magnetically coupled to the low voltage side coil 12A. The high voltage side coil 11B is provided between the low voltage side coil 12A and the low voltage side coil 12B and is opposed to the low voltage side coil 12B, and is magnetically coupled to the low voltage side coil 12B.

The high-voltage side coil and the low-voltage side coil in each coil group are wound around the leg part through the window parts on both sides of the leg part, and are laminated in the extending direction of the leg part. That is, in the first coil group G1, the high-

voltage coils

1A and 1B and the low-

voltage coils

2A and 2B are wound around the first leg 111 through the window W1 and the window W2, and the extending direction of the first leg 111 Are stacked.

In the second coil group G2, the high

voltage side coils

11A and 11B and the low

voltage side coils

12A and 12B are wound around the second leg part 112 through the window part W2 and the window part W3, and are laminated in the extending direction of the second leg part 112. Has been.

The transformer 100 includes a tank 130 that houses the iron core 110, the first coil group G1, and the second coil group G2 in a state of being immersed in insulating oil, a cooler 140 that cools the insulating oil, and a pump 150 that circulates the insulating oil. With. As the cooler 140, a cooler such as an air cooling method or a water cooling method can be used.

The tank 130 has one side wall 138 and the other side wall 139 facing each other. The iron core 110 is arranged inside the tank 130 so that the direction perpendicular to the one side wall 138 and the other side wall 139 and the lamination direction of the magnetic steel plates constituting the iron core 110 are substantially parallel.

An opening 131 and an opening 134 are formed in one side wall 138 of the tank 130. An opening 132 and an opening 133 are formed in the other side wall 139 of the tank 130. The tank 130 is filled with insulating oil for cooling the iron core 110, the high-voltage side coils 1A, 1B, 11A, and 11B and the low-voltage side coils 2A, 2B, 12A, and 12B.

In the transformer 100 according to this embodiment, the cooler 140 is located on the side of the one side wall 138 outside the tank 130. The outlet of the cooler 140 and the opening 131 of the tank 130 are connected by a pipe 161. The inlet of the cooler 140 and the opening 134 of the tank 130 are connected by a pipe 164.

The pump 150 is located outside the tank 130 on the other side wall 139 side. The suction port of the pump 150 and the opening 132 of the tank 130 are connected by a pipe 162. The discharge port of the pump 150 and the opening 133 of the tank 130 are connected by a pipe 163.

The transformer 100 includes a metal plate 135 positioned between the first leg 111 and the second leg 112 of the iron core 110. As shown in FIG. 2, the transformer main body 51 is composed of the iron core 110, the first coil group G 1, the second coil group G 2, and the metal plate 135.

The window W2 is divided into two by the metal plate 135 into the first coil group G1 side and the second coil group G2. In the present embodiment, the metal plate 135 is made of a magnetic material.

In the metal plate 135, at least one end of the metal plate 135 extends so as to be connected to the side wall of the tank 130. In the present embodiment, one end in the extending direction of the metal plate 135 is connected to one side wall 138 of the tank 130 facing each other. The other end of the metal plate 135 in the extending direction is connected to the other side wall 139 of the tank 130 facing each other.

Specifically, one end of the metal plate 135 and one side wall 138 of the tank 130 are welded and fixed to each other. The other end of the metal plate 135 and the other side wall 139 of the tank 130 are welded and fixed to each other.

The space inside the tank 130 is divided into two by the metal plate 135 into the first coil group G1 side and the second coil group G2 side. The opening 131 and the opening 132 of the tank 130 are located on the first coil group G1 side. The opening 133 and the opening 134 of the tank 130 are located on the second coil group G2 side.

As a result, when the pump 150 is operated, the insulating oil that has flowed from the opening 131 to the first coil group G1 side in the tank 130 as shown by the arrow 10 becomes the window W1 and the window as shown by the arrow 11. It passes through the first coil group G1 side of W2 and reaches the suction port of the pump 150 from the opening 132.

The insulating oil sucked into the pump 150 from the suction port is pressurized and sent out toward the discharge port as indicated by an arrow 12. The insulating oil discharged from the discharge port of the pump 150 flows into the second coil group G2 side in the tank 130 from the opening 133 as shown by the arrow 13, and as shown by the arrow 14, the second coil group of the window W2. It passes through the G2 side and the window W3 and reaches the inlet of the cooler 140 through the opening 134.

The insulating oil that has flowed into the cooler 140 from the inlet flows toward the outlet as indicated by the arrow 15 while being cooled. The insulating oil flowing out from the outlet of the cooler 140 flows into the first coil group G1 side in the tank 130 from the opening 131 as indicated by the arrow 10.

Thus, the pump 150 allows the insulating oil to pass through the cooler 140 between the first coil group G1 side and the second coil group G2 side in the tank 130 separated by one end side of the metal plate 135. To move. By circulating the insulating oil cooled by the cooler 140, the first coil group G1 and the second coil group G2 can be sequentially cooled.

The flow direction of the insulating oil may be reversed. That is, the insulating oil cooled by the cooler 140 may flow from the opening 134 to the second coil group G2 side in the tank 130. Further, the pump 150 may be positioned on the side of one side wall 138 outside the tank 130. In this case, the pipe 162 and the pipe 163 are connected to each other.

Here, the configuration of the transformer according to the comparative example will be described. FIG. 3 is a cross-sectional plan view illustrating a configuration of a transformer according to a comparative example. As shown in FIG. 3, in the transformer 900 according to the comparative example, an opening 931 is formed in one side wall 938 of the tank 930. An opening 932 is formed in the other side wall 939 of the tank 930.

In the transformer 900 according to the comparative example, the cooler 140 is located on the side of one side wall 938 outside the tank 930. The outlet of the cooler 140 and the opening 931 of the tank 930 are connected by a pipe 161. The pump 150 is located on the other side wall 939 side outside the tank 930. The suction port of the pump 150 and the opening 932 of the tank 930 are connected by a pipe 162. The discharge port of the pump 150 and the inlet of the cooler 140 are connected by a pipe 963 routed outside the tank 930.

The transformer 900 includes a metal plate 915 positioned between the first leg 111 and the second leg 112 of the iron core 110. One end of the metal plate 915 in the extending direction is separated from one side wall 938 of the tank 930 facing each other. The other end in the extending direction of the metal plate 915 is separated from the other side wall 939 of the tank 930 facing each other. Specifically, the metal plate 915 extends from one side surface of the iron core 110 to the other side surface. Thus, in the transformer 900 according to the comparative example, the space inside the tank 930 is not divided.

Therefore, when the pump 150 is operated, the insulating oil that has flowed into the tank 930 from the opening 931 as shown by the arrow 90 passes through each window portion as shown by the arrow 93 and passes through the opening 932 to the suction port of the pump 150. To reach.

The insulating oil sucked into the pump 150 from the suction port is pressurized and sent out toward the discharge port as indicated by an arrow 94. The insulating oil discharged from the discharge port of the pump 150 flows through the pipe 963 and reaches the inlet of the cooler 140.

The insulating oil that has flowed into the cooler 140 from the inlet flows toward the outlet as indicated by an arrow 95 while being cooled. The insulating oil that has flowed out from the outlet of the cooler 140 flows into the tank 930 from the opening 931 as indicated by an arrow 90.

Thus, in the transformer 900 according to the comparative example, the insulating oil in the tank 930 is circulated without being divided into the first coil group G1 side and the second coil group G2 side. Therefore, the insulating oil flows uniformly in the tank 930 from the one side wall 938 side toward the other side wall 939 side.

FIG. 4 is a graph comparing the pressure and flow rate of the insulating oil flowing in the tank in the transformer according to the present embodiment and the transformer according to the comparative example. In FIG. 4, the vertical axis represents pressure, and the horizontal axis represents flow rate. Further, a curve indicating the relationship between the discharge flow rate (Q) and the discharge pressure (P) of the pump 150 is represented by a solid line 1 and a resistance curve of the insulating oil flow path of the transformer 100 according to the present embodiment is represented by a solid line 2. A resistance curve of the insulating oil flow path of the transformer 900 according to the example is indicated by a dotted line 3.

As shown in FIG. 4, in the transformer 100 according to the present embodiment, the pressure value is P ₁ and the flow rate is Q ₁ at the operating point of the pump 150 that is the intersection of the solid line 1 and the solid line 2. In the transformer 900 according to the comparative example, the pressure value is P ₂ and the flow rate Q ₂ at the operating point of the pump 150 that is the intersection of the solid line 1 and the dotted line 3.

In the transformer 100 according to the present embodiment, since the inside of the tank 130 is divided into the first coil group G1 side and the second coil group G2 side, the flow path through which the insulating oil flows in the tank is a comparative example. Longer than such a transformer 900. On the other hand, in the transformer 900 according to the comparative example, since the length of the pipe 963 is long, the flow path through which the insulating oil flows outside the tank is long compared to the transformer 100 according to the present embodiment.

As a result, the operating point of the pump 150, slightly larger than the pressure value P ₂ of the transformer 900 the pressure value P ₁ of the transformer 100 according to the present embodiment according to the comparative example. Thus, in the operating point of the pump 150, slightly smaller than the flow rate Q ₂ of the transformer 900 to flow to Q ₁ transformer 100 according to the present embodiment according to the comparative example.

The coil cooling performance with the insulating oil increases as the flow rate of the insulating oil increases. In the transformer 100 according to the present embodiment, since the inside of the tank 130 is divided into the first coil group G1 side and the second coil group G2 side, each of the first coil group G1 and the second coil group G2 The flow rate of the insulating oil flowing through is the discharge flow rate Q ₁ of the pump 150. On the other hand, in the transformer 900 according to the comparative example, since the inside of the tank 130 is not divided, the flow rate of the insulating oil flowing through each of the first coil group G1 and the second coil group G2 is the discharge flow rate of the pump 150. the Q _2/2, which is half.

Therefore, in the transformer 100 according to the present embodiment, by causing the metal plate 135 to function as a partition plate, each of the first coil group G1 and the second coil group G2 is compared with the transformer 900 according to the comparative example. The flow rate of the flowing insulating oil can be approximately doubled to improve the coil cooling efficiency.

Further, in the transformer 100 according to the present embodiment, the pipe 963 does not need to be routed outside the tank 930 unlike the transformer 900 according to the comparative example, and therefore, the tank 130 as compared with the transformer 900 according to the comparative example. The transformer 100 can be reduced in size by shortening the pipe connecting the cooler 140.

Furthermore, in the transformer 100 according to the present embodiment, one end in the extending direction of the metal plate 135 is connected to a position between the opening 131 and the opening 134 of the one side wall 138 of the tank 130. The other end of the metal plate 135 in the extending direction is connected to a position between the opening 132 and the opening 133 on the other side wall 139 of the tank 130. Thus, by making the metal plate 135 function as a reinforcing plate, the strength of the side wall of the tank can be ensured while reducing the thickness of the tank. As a result, the transformer 100 can be reduced in size and weight.

FIG. 5 is a circuit diagram showing a configuration of an AC train including a transformer according to the present embodiment. As shown in FIG. 5, the AC train 201 including the transformer 100 according to the present embodiment includes a pantograph 92, a transformer device 101, and motors MA and MB. Transformer 101 includes a transformer body 51,

converters

5A and 5B, and

inverters

6A and 6B.

In the transformer body 51, each coil is divided into a first coil group G1 and a second coil group G2. That is, the high

voltage side coils

1A and 1B are obtained by dividing the high voltage side coil 1, the low voltage side coils 2A and 2B are obtained by dividing the low voltage side coil 2, and the high

voltage side coils

11A and 11B are obtained by dividing the high voltage side coil 11. The low voltage side coils 12 A and 12 B are obtained by dividing the low voltage side coil 12.

The pantograph 92 is connected to the overhead line 91. High-voltage side coil 1A has a first end connected to pantograph 92 and a second end. High voltage side coil 1B has a first end connected to the second end of high voltage side coil 1A and a second end connected to a ground node to which a ground voltage is supplied. High voltage side coil 11 A has a first end connected to pantograph 92 and a second end. High voltage side coil 11B has a first end connected to the second end of high voltage side coil 11A and a second end connected to a ground node to which a ground voltage is supplied.

The low voltage side coil is provided corresponding to the high voltage side coil and is magnetically coupled to the corresponding high voltage side coil. That is, low voltage side coil 2A is magnetically coupled to high voltage side coil 1A, and has a first end connected to the first input terminal of converter 5A, and a second end. The low voltage side coil 2B is magnetically coupled to the high voltage side coil 1B, and has a first end connected to the second end of the low voltage side coil 2A and a second end connected to the second input terminal of the converter 5A. Have. Low voltage side coil 12A is magnetically coupled to high voltage side coil 11A, and has a first end connected to a first input terminal of converter 5B, and a second end. The low voltage side coil 12B is magnetically coupled to the high voltage side coil 11B, and has a first end connected to the second end of the low voltage side coil 12A and a second end connected to the second input terminal of the converter 5B. Have.

FIG. 6 is a view showing a VI-VI cross section of the transformer main body in FIG. 2 and currents and magnetic fluxes generated in the transformer main body. First, a single-phase AC voltage is supplied from the overhead wire 91 to the pantograph 92. The AC voltage supplied from the overhead wire 91 is applied to the high voltage side coils 1A, 1B, 11A, and 11B via the pantograph 92. That is, the high-voltage side coil in each coil group receives a common single-phase AC power. Then, as shown in FIG. 6, an alternating current IH flows through the high voltage side coils 1A, 1B, 11A, and 11B.

The main magnetic flux FH1 is generated in the iron core 110 by the alternating current IH flowing through the high-

voltage side coils

1A and 1B. Then, the alternating current IL1 and the alternating voltage corresponding to the ratio of the number of turns of the low voltage side coil 2A and the number of turns of the high voltage side coil 1A are generated in the low voltage side coil 2A by the main magnetic flux FH1. The main magnetic flux FH1 generates an alternating current IL1 and an alternating voltage in the low voltage side coil 2B according to the ratio of the number of turns of the low voltage side coil 2B and the number of turns of the high voltage side coil 1B.

Here, since the number of turns of the low voltage side coils 2A and 2B is smaller than the number of turns of the high

voltage side coils

1A and 1B, respectively, the AC voltage obtained by stepping down the AC voltage applied to the high

voltage side coils

1A and 1B is reduced. 2B, respectively.

Similarly, the main magnetic flux FH11 is generated by the alternating current IH flowing through the high-

voltage side coils

11A and 11B. Then, the alternating current IL11 and the alternating voltage corresponding to the ratio of the number of turns of the low voltage side coil 12A and the number of turns of the high voltage side coil 11A are generated in the low voltage side coil 12A by the main magnetic flux FH11. The main magnetic flux FH11 generates an alternating current IL11 and an alternating voltage in the low voltage side coil 12B according to the ratio of the number of turns of the low voltage side coil 12B and the number of turns of the high voltage side coil 11B.

Here, since the number of turns of the low

voltage side coils

12A and 12B is smaller than the number of turns of the high

voltage side coils

11A and 11B, respectively, the AC voltage obtained by stepping down the AC voltage applied to the high

voltage side coils

11A and 11B is reduced. 12B, respectively.

The alternating voltage induced in the low voltage side coils 2A and 2B is supplied to the converter 5A. Further, the AC voltage induced in low

voltage side coils

12A and 12B is supplied to converter 5B.

Converter 5A converts the AC voltage supplied from low voltage side coils 2A and 2B into a DC voltage and outputs it to inverter 6A. Converter 5B converts the AC voltage supplied from low

voltage side coils

12A and 12B into a DC voltage and outputs the DC voltage to inverter 6B.

The inverter 6A converts the DC voltage received from the converter 5A into a three-phase AC voltage and outputs it to the motor MA. Inverter 6B converts the DC voltage received from converter 5B into a three-phase AC voltage and outputs it to motor MB.

The motor MA is driven based on the three-phase AC voltage received from the inverter 6A. Motor MB is driven based on the three-phase AC voltage received from inverter 6B. Thus, the low voltage side coils 2A and 2B of the first coil group G1 and the low

voltage side coils

12A and 12B of the second coil group G2 are coupled to separate loads.

In the transformer main body 51, the low voltage side coil and the high voltage side coil are divided into a plurality of coil groups, and a leg is provided for each coil group. And the low voltage | pressure side coil and high voltage | pressure side coil in a some coil group are wound around a some leg part, respectively. With such a configuration, the height of the transformer, that is, the length of the transformer in the extending direction of the legs can be reduced. Further, it is not necessary to increase the cross-sectional area of the conductive wire of the coil, and an increase in power loss in the coil can be prevented.

That is, in the transformer main body 51, since the low

voltage side coils

2 and 12 and the high

voltage side coils

1 and 11 are divided into two coil groups, the power capacity of each coil group is halved. Here, the supply voltage is constant, and from the power capacity = voltage × current, when the power capacity of each coil group is halved, the current flowing through each coil is halved. Thereby, since the number of disk windings stacked in each coil can be reduced, the height of the transformer can be reduced. Alternatively, instead of reducing the number of disk windings, by reducing the cross-sectional area of the conductive wires of the high voltage side coils 1A, 1B, 11A, 11B and the low voltage side coils 2A, 2B, 12A, 12B, The height of the entire transformer can be reduced.

Next, the problem of the decrease in reactance in the transformer and the means for solving it will be described. FIG. 7 is a diagram showing the leakage magnetic flux in the transformer according to this embodiment. As shown in FIG. 7, in the transformer main body 51, leakage magnetic fluxes FKH 1 and FKH 11 that do not flow through the iron core 110 are generated in addition to the main magnetic fluxes FH 1 and FH 11 generated by the alternating current IH flowing through the high-voltage side coil. Further, leakage magnetic fluxes FKL1 and FKL11 that do not flow through the iron core 110 are generated by the alternating currents IL1 and IL11 that flow through the low-voltage side coil.

FIG. 8 is a diagram showing the main magnetic flux during one-side operation in the transformer according to the present embodiment. As shown in FIG. 8, in the transformer main body 51, for example, even when the motor MB fails, it is possible to operate the motor MA alone using the coil group G1. In such one-side operation, the high-

voltage side coils

11A and 11B and the low-

voltage side coils

12A and 12B do not function, that is, no current flows through the high-

voltage side coils

11A and 11B and the low-

voltage side coils

12A and 12B. Does not occur.

FIG. 9 is a diagram showing a leakage magnetic flux during one-side operation in a configuration in which it is assumed that the transformer according to this embodiment does not include a metal plate. As shown in FIG. 9, for example, if the motor MB fails and no current flows through the high

voltage side coils

11A and 11B and the low

voltage side coils

12A and 12B, the leakage magnetic fluxes FKH11 and FKL11 are not generated.

Here, since the transformer shown in FIG. 9 does not include the metal plate 135, the leakage magnetic fluxes FKH1 and FKL1 spread in the window W2, and the magnetic path length becomes long. For this reason, compared with the state shown in FIG. 7, the magnetomotive force in window part W2 becomes 1/2. That is, since the magnitude of the leakage magnetic flux in the window W2 is halved, the reactances of the low voltage side coils 2A and 2B and the high

voltage side coils

1A and 1B are reduced.

Here, according to Ampere's law, the strength of the magnetic field is inversely proportional to the magnetic path length. The weak magnetic field means that the magnetic flux density is small and the self-inductance of the coil is small. In addition, reactance is greatly affected by leakage inductance caused by a leakage magnetic field. Therefore, when the magnetic path length is increased, the magnetic field is weakened and the self-inductance of the coil is reduced. If it does so, a reactance will fall because leakage inductance falls.

7, the leakage magnetic fluxes FKH1 and FKH11 are combined, and the leakage magnetic fluxes FKL1 and FKL11 are combined, so that the magnetomotive force in the window W2 is twice that in the state shown in FIG. . For this reason, even if the magnetic path lengths of the leakage magnetic fluxes FKH1 and FKH11 and the leakage magnetic fluxes FKL1 and FKL11 are the same as those shown in FIG. 9, the high-voltage side coils 1A, 1B, 11A, 11B and the low-voltage side coils 2A, 2B, The reactance of 12A and 12B does not decrease.

FIG. 10 is a diagram showing a leakage magnetic flux at the time of one-side operation in the transformer according to the present embodiment. As shown in FIG. 10, for example, when the motor MB fails and no current flows through the high

voltage side coils

11A and 11B and the low

voltage side coils

12A and 12B, the leakage magnetic fluxes FKH11 and FKL11 are not generated.

For this reason, the magnetomotive force in the window W2 is halved compared to the state shown in FIG. However, in the transformer main body 51, the leakage fluxes FKH1 and FKL1 flow through the metal plate 135. As a result, the leakage magnetic fluxes FKH1 and FKL1 do not spread within the window portion W2, so that the magnetic path lengths of the leakage magnetic fluxes FKH1 and FKL1 can be halved compared to the state shown in FIG. Since the metal plate 135 is made of a magnetic material, a magnetic path can be formed similarly to the iron core 110.

Therefore, the reactances of the low voltage side coils 2A and 2B and the high

voltage side coils

1A and 1B are the same as the state shown in FIG. Therefore, the transformer main body 51 can prevent the reactances of the low-voltage side coils 2A and 2B and the high-

voltage side coils

1A and 1B from decreasing even during one-side operation, and a stable reactance can be obtained. .

Here, in the three-phase transformer, for example, an iron core (interphase iron core) is provided between the coils of each phase in order to pass the main magnetic flux. On the other hand, the transformer according to the present embodiment is a single-phase transformer. Single-phase transformers usually do not require interphase iron cores like three-phase transformers. However, in the transformer according to the present embodiment, a metal plate is disposed on the iron core, and for example, when one motor fails and only the other motor is operated, the magnetic path length is prevented from increasing, and the reactance is reduced. Is preventing.

Hereinafter, a transformer according to Embodiment 2 of the present invention will be described. Since the transformer according to the present embodiment is different from the transformer 100 according to the first embodiment only in the form of connection with a load in an AC train, the description of other configurations will not be repeated.

(Embodiment 2)
FIG. 11 is a circuit diagram showing a configuration of an AC train including a transformer according to Embodiment 2 of the present invention. As shown in FIG. 11, an AC train 205 including a transformer according to Embodiment 2 of the present invention includes a pantograph 92, a transformer 105, and motors MA, MB, MC, MD.

The transformer device 105 includes a transformer main body 55,

converters

5A, 5B, 5C, and 5D, and

inverters

6A, 6B, 6C, and 6D. The transformer main body 55 includes coil groups G1 and G2. The coil group G1 includes high-

voltage side coils

1A and 1B and low-voltage side coils 2A and 2B. The coil group G2 includes high

voltage side coils

11A and 11B and low

voltage side coils

12A and 12B.

In the transformer 105, the low voltage side coils 2A, 2B, 12A, 12B are coupled to separate loads. That is, the low voltage side coil 2A is magnetically coupled to the high voltage side coil 1A, and has a first end connected to the first input terminal of the converter 5A and a second end connected to the second input terminal of the converter 5A. Have Low voltage side coil 2B is magnetically coupled to high voltage side coil 1B, and has a first end connected to the first input terminal of converter 5C and a second end connected to the second input terminal of converter 5C. .

Low voltage side coil 12A is magnetically coupled to high voltage side coil 11A and has a first end connected to the first input terminal of converter 5B and a second end connected to the second input terminal of converter 5B. . Low voltage side coil 12B is magnetically coupled to high voltage side coil 11B and has a first end connected to the first input terminal of converter 5D and a second end connected to the second input terminal of converter 5D. .

The single-phase AC voltage supplied from the overhead wire 91 is supplied to the high-voltage side coils 1A, 1B, 11A, and 11B via the pantograph 92. An alternating voltage is induced in the low voltage side coils 2A and 12A by the alternating voltage supplied to the high

voltage side coils

1A and 11A, respectively. An AC voltage is induced in the low

voltage side coils

2B and 12B by the AC voltage supplied to the high

voltage side coils

1B and 11B, respectively.

The converter 5A converts the AC voltage induced in the low voltage side coil 2A into a DC voltage. Converter 5B converts the AC voltage induced in low voltage side coil 12A into a DC voltage. Converter 5C converts the AC voltage induced in low voltage side coil 2B into a DC voltage. Converter 5D converts the AC voltage induced in low voltage side coil 12B into a DC voltage.

The inverter 6A converts the DC voltage received from the converter 5A into a three-phase AC voltage and outputs it to the motor MA. Inverter 6B converts the DC voltage received from converter 5B into a three-phase AC voltage and outputs it to motor MB. Inverter 6C converts the DC voltage received from converter 5C into a three-phase AC voltage and outputs it to motor MC. Inverter 6D converts the DC voltage received from converter 5D into a three-phase AC voltage and outputs it to motor MD.

The motor MA is driven based on the three-phase AC voltage received from the inverter 6A. Motor MB is driven based on the three-phase AC voltage received from inverter 6B. Motor MC is driven based on the three-phase AC voltage received from inverter 6C. Motor MD is driven based on the three-phase AC voltage received from inverter 6D.

Also in the transformer according to the present embodiment configured as described above, it is possible to reduce the height of the transformer and prevent a decrease in reactance.

Hereinafter, a transformer according to Embodiment 3 of the present invention will be described. Since the transformer according to the present embodiment is different from the transformer 100 according to the first embodiment only in the form of connection with a load in an AC train, the description of other configurations will not be repeated.

(Embodiment 3)
FIG. 12 is a circuit diagram showing a configuration of an AC train including a transformer according to Embodiment 3 of the present invention. As shown in FIG. 12, an AC train 206 including a transformer according to Embodiment 3 of the present invention includes a pantograph 92, a transformer device 106, and motors MA, MB, MC, MD.

The transformer device 106 includes a transformer main body 56,

converters

5A, 5B, 5C, and 5D, and

inverters

6A, 6B, 6C, and 6D. The transformer main body 56 includes coil groups G1 and G2. The coil group G1 includes high-

voltage side coils

1A and 1B and low-voltage side coils 2A and 2B. The coil group G2 includes high

voltage side coils

11A and 11B and low

voltage side coils

12A and 12B.

In the transformer 106, the high voltage side coils 1A, 1B, 11A, and 11B are connected in parallel to each other, and the low voltage side coils 2A, 2B, 12A, and 12B are coupled to separate loads. That is, the high voltage side coil 1A has a first end connected to the pantograph 92 and a second end connected to a ground node to which a ground voltage is supplied. High-voltage side coil 1B has a first end connected to pantograph 92 and a second end connected to a ground node to which a ground voltage is supplied. High voltage side coil 11A has a first end connected to pantograph 92 and a second end connected to a ground node to which a ground voltage is supplied. High voltage side coil 11B has a first end connected to pantograph 92 and a second end connected to a ground node to which a ground voltage is supplied.

Low voltage side coil 2A is magnetically coupled to high voltage side coil 1A and has a first end connected to the first input terminal of converter 5A and a second end connected to the second input terminal of converter 5A. . Low voltage side coil 2B is magnetically coupled to high voltage side coil 1B, and has a first end connected to the first input terminal of converter 5C and a second end connected to the second input terminal of converter 5C. . Low voltage side coil 12A is magnetically coupled to high voltage side coil 11A and has a first end connected to the first input terminal of converter 5B and a second end connected to the second input terminal of converter 5B. . Low voltage side coil 12B is magnetically coupled to high voltage side coil 11B and has a first end connected to the first input terminal of converter 5D and a second end connected to the second input terminal of converter 5D. .

voltage side coils

1A and 11A, respectively. An AC voltage is induced in the low

voltage side coils

2B and 12B by the AC voltage supplied to the high

voltage side coils

1B and 11B, respectively.

Hereinafter, a transformer according to Embodiment 4 of the present invention will be described. Since the transformer according to the present embodiment is different from the transformer 100 according to the first embodiment only in that the metal plate is separated from the other side wall of the tank, the description of other configurations will not be repeated.

(Embodiment 4)
FIG. 13 is a cross-sectional plan view illustrating a configuration of a transformer according to Embodiment 4 of the present invention. FIG. 14 is a perspective view of the internal configuration of the transformer of FIG. 13 as seen from the direction indicated by arrow XIV. As shown in FIGS. 13 and 14, the transformer 200 according to the fourth embodiment of the present invention is a shell type transformer.

The transformer 200 includes a tank 230 that houses the iron core 110, the first coil group G1, and the second coil group G2 in a state of being immersed in insulating oil. The tank 230 has one side wall 238 and the other side wall 239 facing each other. The iron core 110 is arranged inside the tank 230 so that the direction perpendicular to the one side wall 238 and the other side wall 239 and the lamination direction of the magnetic steel plates constituting the iron core 110 are substantially parallel.

An opening 231 and an opening 232 are formed in one side wall 238 of the tank 230. The tank 230 is filled with insulating oil that cools the iron core 110, the high-voltage side coils 1A, 1B, 11A, and 11B and the low-voltage side coils 2A, 2B, 12A, and 12B.

In the transformer 200 according to the present embodiment, the cooler 140 is located on the side of one side wall 238 outside the tank 230. The outlet of the cooler 140 and the opening 231 of the tank 230 are connected by a pipe 161. The pump 150 is located on the one side wall 238 side outside the tank 230. The suction port of the pump 150 and the opening 232 of the tank 230 are connected by a pipe 162. The discharge port of the pump 150 and the inflow port of the cooler 140 are connected by a pipe 263.

The transformer 200 includes a metal plate 235 positioned between the first leg 111 and the second leg 112 of the iron core 110. As shown in FIG. 14, the transformer main body 52 is configured by the iron core 110, the first coil group G 1, the second coil group G 2, and the metal plate 235.

The metal plate 235 divides the window W2 into two parts, the first coil group G1 side and the second coil group G2. In the present embodiment, the metal plate 235 is made of a magnetic material.

In the present embodiment, one end in the extending direction of the metal plate 235 is connected to one side wall 238 of the tank 230 facing each other. The other end of the metal plate 235 in the extending direction is separated from the other side wall 239 of the tank 230 facing each other.

Specifically, one end of the metal plate 235 and one side wall 238 of the tank 230 are welded and fixed to each other. The other end surface of the metal plate 235 is located on the same plane as the other side surface of the iron core 110.

The metal plate 235 divides the space on one side wall 238 side into two into a first coil group G1 side and a second coil group G2 side inside the tank 130. The opening 231 of the tank 230 is located on the first coil group G1 side. The opening 232 of the tank 230 is located on the second coil group G2 side.

As a result, when the pump 150 is operated, the insulating oil that has flowed into the first coil group G1 side in the tank 230 from the opening 231 as shown by the arrow 20 is, as shown by the arrow 21, the window W1 and the window. It passes through the first coil group G1 side of W2. The insulating oil that has reached the side of the other side wall 239 in the tank 130 flows from the first coil group G1 side to the second coil group G2 side as indicated by the arrow 22.

The insulating oil that has flowed into the second coil group G2 side passes through the second coil group G2 side of the window W2 and the window W3 as indicated by the arrow 23 and reaches the suction port of the pump 150 from the opening 232.

The insulating oil sucked into the pump 150 from the suction port is pressurized and sent out toward the discharge port as indicated by an arrow 24. The insulating oil discharged from the discharge port of the pump 150 reaches the inlet of the cooler 140 as indicated by an arrow 25.

The insulating oil that has flowed into the cooler 140 from the inlet flows toward the outlet as indicated by an arrow 25 while being cooled. The insulating oil flowing out from the outlet of the cooler 140 flows into the first coil group G1 side in the tank 230 from the opening 231 as indicated by an arrow 20.

In this way, the pump 150 allows the insulating oil to pass through the cooler 140 between the first coil group G1 side and the second coil group G2 side in the tank 230 separated by one end side of the metal plate 235. To move. By circulating the insulating oil cooled by the cooler 140, the first coil group G1 and the second coil group G2 can be sequentially cooled.

The flow direction of the insulating oil may be reversed. That is, the insulating oil cooled by the cooler 140 may flow from the opening 232 to the second coil group G2 side in the tank 230.

Also in the transformer 200 according to the present embodiment, by causing the metal plate 235 to function as a partition plate, insulation that flows in each of the first coil group G1 and the second coil group G2 as compared with the transformer 900 according to the comparative example. The oil flow rate can be doubled to improve coil cooling efficiency.

Further, in the transformer 200 according to the present embodiment, the pipe 963 does not need to be routed outside the tank 930 unlike the transformer 900 according to the comparative example, and therefore the tank 230 compared with the transformer 900 according to the comparative example. The transformer 200 can be reduced in size by shortening the pipe connecting the cooler 140. In the transformer 200, since the piping is provided only on the one side wall 238 side of the tank 230, the size can be further reduced as compared with the transformer 100 according to the first embodiment.

Furthermore, in the transformer 200 according to the present embodiment, one end in the extending direction of the metal plate 235 is connected to a position between the opening 231 and the opening 232 of the one side wall 238 of the tank 230. Thus, by making the metal plate 235 function as a reinforcing plate, it is possible to ensure the strength of the side wall of the tank while reducing the thickness of the tank. As a result, the transformer 200 can be reduced in size and weight.

Also in the transformer main body 52, it is possible to prevent the reactances of the low voltage side coils 2A and 2B and the high

voltage side coils

1A and 1B from being lowered during one-side operation, and a stable reactance can be obtained.

In addition, the said embodiment disclosed this time is an illustration in all the points, Comprising: It does not become the basis of a limited interpretation. Therefore, the technical scope of the present invention is not interpreted only by the above-described embodiments, but is defined based on the description of the scope of claims. In addition, meanings equivalent to the claims and all modifications within the scope are included.

1 high voltage side coil, 2 low voltage side coil, 5A, 5B, 5C, 5D converter, 6A, 6B, 6C, 6D inverter, 51, 52, 55, 56 transformer body, 100, 200, 900 transformer, 91 overhead wire , 92 Pantograph, 101, 105, 106 Transformer, 110 Iron core, 111 First leg, 112 Second leg, 130, 230, 930 Tank, 131, 132, 133, 134, 231, 232, 931, 932

Open

135, 235, 915 Metal plate, 138, 139, 238, 239, 938, 939 Side wall, 140 cooler, 150 pump, 161, 162, 163, 164, 263, 963 piping, 201, 205, 206 AC train, FH1, FH11 main magnetic flux, FKH1, FKH11, FKL1 leakage Beam, G1 a first coil group, G2 second coil group, IH, IL1, IL11 alternating current, MA, MB, MC, MD, MA, MC, MD motor, W1, W2, W3 window.

Claims

An iron core having a first leg and a second leg that are spaced apart from each other;
A first coil including a plurality of high voltage side coils wound around the first leg and a plurality of low voltage side coils provided corresponding to the high voltage side coils and magnetically coupled to the corresponding high voltage side coils; Groups,
A second coil including a plurality of high voltage side coils wound around the second leg and a plurality of low voltage side coils provided corresponding to the high voltage side coils and magnetically coupled to the corresponding high voltage side coils; Groups,
A tank that accommodates the iron core, the first coil group, and the second coil group immersed in insulating oil;
A cooler for cooling the insulating oil;
A pump for circulating the insulating oil;
A metal plate positioned between the first leg and the second leg;
Each of the high-voltage side coils receives a common single-phase AC power,
The low voltage side coil of the first coil group and the low voltage side coil of the second coil group are coupled to separate loads;
In the metal plate, it extends so that at least one end of the metal plate is connected to the side wall of the tank,
The pump moves the insulating oil through the cooler between the first coil group side and the second coil group side in the tank separated by the metal plate on the one end side. Let the transformer.
The transformer according to claim 1, wherein the metal plate is made of a magnetic material.
The one end in the extending direction of the metal plate is connected to one side wall of the tank facing each other,
3. The transformer according to claim 1, wherein the other end of the metal plate in the extending direction is connected to the other side walls of the tank facing each other.
The one end in the extending direction of the metal plate is connected to one side wall of the tank facing each other,
3. The transformer according to claim 1, wherein the other end in the extending direction of the metal plate is separated from the other side walls of the tank facing each other.